PSY 177 Lecture Notes - Lecture 16: Autism Spectrum, Fetus, Hindbrain
31 May 2017
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Document Summary
Nervous system emerges early in development from cell layer of embryo. Ectoderm, the outer layer, becomes the nervous system. The neural groove forms between ridges of the ectoderm. Development of the nervous system in the human embryo and fetus. Neural groove deepens and forms neural tube. Inside of neural tube will become the brain"s ventricles. By 24 days, outer layer of neural tube shows subdivisions of future brain. Development of the nervous system can be divided into six distinct stages. Synapses form rapidly on dendrites and dendritic spines. Spines proliferate after birth, and connections are affected by experience. The nerve cell body increases in volume to support the dendritic tree. Cell death, or apoptosis, is a normal part of development. Cells have death genes that are expressed only during apoptosis. Caspases are a family of proteases that cut up proteins and dna. Apoptosis starts with a ca2+ influx that causes mitochondria to release a protein, diablo.
